Embedded system requires a regulated power supply. This power supply circuit gives a variable regulated supply and switches off in no load condition.

Through an arrangement of voltage regulator 7805 and a potentiometer the output voltage is varied from 3.7V to 8.7V. Another feature of this power supply is, when no load is there it automatically switches off. It is achieved through an arrangement of transistors and relay.

A: When load is present it automatically switches on the supply otherwise it goes off.

Q: What is the load used?

A: 12V, 6W incandescent lamp is used

Q: What is the formula for calculating smoothing capacitor value?

A: There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.

I got to know to about edgefx through google. I was searching for electronic project in google then i got edgefx website.
I have decided to buy project from edgefx because there was cash on delivery that is why i purchased project from edgefx. I like most about edgefx kit is kit presentation.
the kit was delivered in time with right components.
the team has helped me in purchasing the project.
i gave reference to my friend he has purchased the project.

Anudeep, Guntur on 7th November, 2015, 10:21 PM

Could u please give me the documentation any body

Raghvendra, Allahabad on 15th June, 2015, 10:31 AM

I had took the kit from Jahauri Infotech.I like the complete kit.Yes the delivery is on time with the right components.No suggestions.

Sandon Seaman, CHENNAI on 30th May, 2015, 06:34 PM

Yes the kit delivered on time.The technical support is good and I rate 4 out of 5.It’s ok while building the project I expected more.I recommend to the juniors.